18119639 has 4 divisors (see below), whose sum is σ = 18139056. Its totient is φ = 18100224.

The previous prime is 18119627. The next prime is 18119659. The reversal of 18119639 is 93691181.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 18119639 - 2²⁴ = 1342423 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18119609) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8234 + ... + 10199.

It is an arithmetic number, because the mean of its divisors is an integer number (4534764).

Almost surely, 2^18119639 is an apocalyptic number.

18119639 is a deficient number, since it is larger than the sum of its proper divisors (19417).

18119639 is an equidigital number, since it uses as much as digits as its factorization.

18119639 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19416.

The product of its digits is 11664, while the sum is 38.

The square root of 18119639 is about 4256.7169273984. The cubic root of 18119639 is about 262.6534926942.

The spelling of 18119639 in words is "eighteen million, one hundred nineteen thousand, six hundred thirty-nine".